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Introducing Earth

Introducing Earth. Chapter Eight: Mapping Earth. 8.1 Maps 8.2 Topographic Maps 8.3 Bathymetric Maps. 8.3 Bathymetric Maps. A bathymetric map shows the depths of a body of water such as a lake or an ocean. Bathymetric maps use contour lines like topographic maps. 8.3 Showing depth.

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Introducing Earth

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  1. Introducing Earth

  2. Chapter Eight: Mapping Earth • 8.1 Maps • 8.2 Topographic Maps • 8.3 Bathymetric Maps

  3. 8.3 Bathymetric Maps • A bathymetric mapshows the depths of a body of water such as a lake or an ocean. • Bathymetric maps use contour lines like topographic maps.

  4. 8.3 Showing depth • Color is also used to show depth in a lake or an ocean. • Shallow areas may be light blue and deep areas may be a darker blue.

  5. 8.3 Technology and bathymetric maps • The average ocean depth is 3,711 meters (12,175 feet). • The deepest place of all is the Mariana Trench) which is 10,923 meters (35,838 ft). Can you convert these distances into miles and kilometers?

  6. 8.3 Technology and bathymetric maps • Scientists measure these great depths using a technology called echo sounding or sonar. • A device on a ship sends sound waves outward from the bottom of the ship.

  7. 8.3 Technology and bathymetric maps • Sound waves from the ship “echo” off the ocean floor. • It takes time for the echo to return to the ship. • The longer the echo time, the deeper the water!

  8. 8.3 Nautical charts • Nautical charts are important tools for anyone in interested in navigating bodies of water. • Charts indicate hazards that can sink boats and show markers leading to channels.

  9. Investigation 8B Bathymetry of the Sea Floor • How can we tell what kinds of features are on the sea floor?

  10. Technology Connection Modern Map-Making • According to archaeologists, the history of mapmaking dates all the way back to early humans.

  11. Activity Circle the Globe • In this activity you will create a model of Earth.

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